초록 ▼

Two diaphragms divide a vacuum motor which controls the flow of exhaust gases from the exhaust passage to the induction system into three chambers, the first is fed a modulated vacuum signal from the induction passage, the second either an uncontrolled signal from substantially the aforementioned pa

Two diaphragms divide a vacuum motor which controls the flow of exhaust gases from the exhaust passage to the induction system into three chambers, the first is fed a modulated vacuum signal from the induction passage, the second either an uncontrolled signal from substantially the aforementioned part of the induction passage or a VC vacuum created immediately upstream of the position assumed by the throttle valve in a fully closed position and the third exposed to atmospheric pressure. A relief valve disposed in the conduit through which the modulated vacuum is fed opens upon the pressure therein falling to a predetermined level to further modulate the vacuum in the first chamber. The vacuum regulating device which modulates the vacuum from the induction passage is responsive to atmospheric pressure, a signal which originates immediately downstream of a restriction in the EGR passage which may be either greater or less than atmospheric pressure depending on the design of the restriction and a venturi vacuum signal or the equivalent. To modulate the vacuum in the first chamber the relief valve can feed the vacuum which opens it to a normally atmospheric chamber of the vacuum regulating device.

대표청구항 ▼

An exhaust gas recirculation control system which controls the flow of exhaust gases through an exhaust gas recirculation passage interconnecting the induction system of an internal combustion engine with the exhaust passage of said engine, comprising: exhaust gas recirculation valve means so constr

An exhaust gas recirculation control system which controls the flow of exhaust gases through an exhaust gas recirculation passage interconnecting the induction system of an internal combustion engine with the exhaust passage of said engine, comprising: exhaust gas recirculation valve means so constructed and arranged as to be responsive to first and second pressure signals and atmospheric pressure and control the amount of exhaust gases passing through said exhaust gas recirculation passage in accordance with said first and second pressure signals and the atmospheric pressure, said first and second pressure signals being fed to exhaust gas recirculation valve means via first and second conduit means respectively; vacuum regulating means so constructed and arranged as to be fluidly connected to said exhaust gas recirculation valve means and be responsive to fourth and fifth pressure signals and the atmospheric pressure to modulate the magnitude of said first pressure signal; pressure relief valve means disposed in said first conduit means and so constructed and arranged as to be responsive to said first pressure signal and to open on upon the magnitude of said first pressure signal falling below a predetermined level thus further modulating said first pressure signal by the introduction of said atmospheric pressure into said first conduit means.